I’m new. I can’t fine any way to enter a personal profile, photo, etc. You may tell me how to find this, but I will suggest that you also make the means more obvious.
It’s because you can’t. You need to have a higher trust level (“registered” or “member”, I don’t remember) or something like that.
You can edit your profile by going to /my/preferences/profile, as shown below.
But uploading your own avatar and profile background is restricted. You need to either subscribe or wait till you reach Trust Level 2, which requires a few weeks of engagement in discussions.