[HELP] Your income is risky

so i got this alert when opening my adsense account, can anyone give me solution how to fix it please?

Your income is risky - One or more of your sites do not have the ads.txt file. Fix this now so that it doesn't have a negative impact on your income.

Captain_Nothing said:

https://support.google.com/admanager/answer/7544382?hl=en

Click to expand...

no simple way?okayy.. maybe im just too lazy read this..