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Right click, Fix and fill out an appropriate title for the pdf. A pop-up may not appear, make sure there is a green check mark to indiciate that the issue has been fixed.

Text color will be tested against background color. Images are generally not calculated, but instead the background color behind the image.
Here's a list of approved background colors with labels of correct and incorrect type-color usage.

Right click, select 'Fix' and fill out an appropriate description for each image in the PDF. Use the right arrow to go to the next item and click 'Save & Close'.

Note: Even though your PDF may not have images inside of it, there may be decorative images like lines/bars or something you can't see. If this is the case, check mark 'Decorative Figure':

The appropriate formatting for tables are the following:

<table>
  <tr>
    <th>First Heading</th>
    <th>Second Heading</th>
    <th>Third Heading</th>
  </tr>
  <tr>
    <td>Cell 1 - Row 1</td>
    <td>Cell 2 - Row 1</td>
    <td>Cell 3 - Row 1</td>
  </tr>
  <tr>
    <td>Cell 1 - Row 2</td>
    <td>Cell 2 - Row 2</td>
    <td>Cell 3 - Row 2</td>
  </tr>
</table>

TH is used for the heading cells.

TD is used for regular cells.

For image instructions, follow the 'Tables > Headers' instructions.

If your issue looks like this:

Then you have incorrectly name headings. On the element, right click and then left click on Show in Tags Panel.

Left click on the trouble item in the left bar then expand it.

The <TD>'s under the <TR> need to be changed to say <TH> (for Table Heading).

For more details on how a table should be structured in PDFs, view the "Tables > TH and TD" accordion above.

Now that it's been fixed, go back to the accessibility tab (circled red in picture below), then right click the element and click 'Check Again'.

The error should go away and the message should say Passed.

Alternative Method:

Instructions

To change the Appropriate Nesting, right click the issue and 'Show in Tags Panel'.

This will take you to the heading that is displaying an error.

If the first heading in a PDF is flagged, it鈥檚 usually because it was not marked up as a Level 1 heading. A document must always have a heading 1.

If that's the case, it鈥檚 may say <H2>, which is a level 2 heading. The first heading in a PDF must always be a Level 1 heading.

To fix it, right click to open the menu, the click 'Properties...', change the Type to Heading Level 1.

Repeat this process for all other Header errors.

Headings should always be in order:

<H1>
<H2>
<H3>
<H4>
<H5>
<H6>

Examples:

If a number is skipped like:
<H1>
<H3>

That will produce an error. Change the H3 to H2.

Using Paragraphs <P> (If the Heading isn't working)

A <P> (paragraph) can follow any Heading number and does not need to be in any order.

If needed a <P> can take the place of any heading (besides H1), paragraphs can be used if a heading is still giving you an error.
Do not use <P2> or any numbers inside of the <P>.

Right-click the element > Show in Content Panel, this will take you to the item that is displaying the issue.

Right click on the item in the left bar that is giving the issue and then click 'Find' (the item giving the issue was whatever was selected).

A pop up box will appear, click the dropdown and select 'Unmarked Annotations', click the 'Search Document' button, then click Find.

Once it finds the item, click 'Tag Element'. A new pop up will appear, click the 'Type' dropdown and find the appropriate type for the item. Click Ok.

Keep repeating: 'Tag element' > Type: [Correct type] > OK.

Once it's done it will give a message saying 'Find was complete'.

Go back to the accessibility checker, and right click > check again. The accessibility checker should have a green checkmark now.