Get the nickname in the game.
You can see the replays to find the nick!

Place the nick on the site search bar!

Get the link from the image after finding the profile!
Click with right on image, after in copy image address.

You will copy something similar to link from the image:
And you will take the link part as the example of the image above!

Use the website link to add the code you separated from the image!
O site usado:
merge the links of the avatar finder with the image code.
like the example below:
then put it in your browser.

It will be necessary to login with your steam!
Once you have found the profile with the custom link.
Click on the nick of the profile found as in the image, it may be that q finds more than one, but it is always likely the first.

Soon you will find the steam person's profile link along with other information!
Just get the community link and put it in the browser and be logged in to steam to be able to add it.
And Good Game para vocês ♥♥♥♥♥♥♥.

If you can not find the profile, try your friends!
Enter the site:
Put the nick!
get the nickname of some recent player, and do the same process above in the tutorial.
... Repeat the Tutorial Process

...
Go to Friends:
And find the profile by friends, that has similar characteristics to the image:

https://steamproxy.net/sharedfiles/filedetails/?id=1613827561