Hi @Carla_Jimena_Grandón_Soliz,
Welcome to the Community!
There are no terrible questions, everyone started as a newbie at one point or another :)
Here's what you want to do:
Once you are logged into Trello, click on your user avatar in the top right corner of the page/screen.
In the drop down menu that appears select "Profile and Visibility"
Once you are on your profile page, if you hover over your existing avatar, you should see a link to change it.
I hope that helps!
-Jimmy
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