1) Go to your GA4 account for this website

2) In the address bar, copy the few digits in the URL to the right of the letter “p” (typically). That’s your property ID

2b) Another way to find your GA property ID in GA4 is to click on Admin menu (gear icon at the bottom in the left sidebar) -> Property -> Property Details -> PROPERTY ID on the right side:

3) Copy the property ID (e.g. 360146586) and return to the task View Traffic & Rankings, then paste it there. Voila!