How can I customize my theme/wallpaper?

I went to the settings to customize my wallpaper, but:
 There is none. Can you bring back the customization? Or is this permanent?

Hello, Mirahata 

To customize your wallpaper:

On your profile page,

Click on that little 'Edit' icon located to the right of your username.

Your 'Settings' page will pop up.

There's a list below the word 'Settings'. Click on the 2nd one that says 'Themes'.

This ('Themes') page is where you upload your wallpaper.

On this 'Themes' page, there is a word that says 'Custom' (to the right of the word that says 'Themes'.

There will be a list under 'Custom'.

At the bottom of the list under 'Custom' is a gray (or grey) box that says 'Upload' (located right below the word 'Custom Upload'.

Click on that gray box that says 'Upload'.

It will take you to your own personal list of 'Downloads' that's on your computer.

From there, you could either click on your 'Personal' file or your 'Downloads' file (whichever file the picture you want to upload is in).

And then highlight the file (picture) that you want as a wallpaper for your Chess.com profile. After highlighting the file (picture), click on 'Open' (at the bottom of that list). It should then upload the picture.

I'm assuming that you do have your own pictures (not the ones on this site) that you've downloaded. If you don't, let me know, and I'll tell you how to download pictures onto your own computer.

Let me know how it goes. And I hope things are okay with you