Step 7:

If you want to check ads.txt is available or not in your own WordPress site, just click "ADS TXT" at the top right of "WordPress" and "ads.txt file".

As shown in the pictures below:

Step 8:

If you want to display ads.txt, then click on the ads.txt icon. If you don't want to display ads.txt, then click on the ads.txt icon again.

As shown in the pictures below:

After creating ads.txt, you only need to wait for 10 or 20 minutes and then go back to your Google AdSense account to check if the word "Earnings at risk" is still there, if not, means that it is successful!

As shown in the pictures below: