[tdiamond]

I am trying to change my avatar pic but keep getting page does not exist. How do I fix this? Visitors unable to upload pic as avatar.

[@mercime]

WP/BP versions? Single or multisite BP? Is this a new install?
Are you using bp-default theme or child theme of bp-default or a custom theme?
Is image upload working for your post and if so, does the image show up in your post?
Disable all plugins except BuddyPress and activate bp-default theme.
https://codex.buddypress.org/troubleshooting/avatar-upload-fails/