Why cant I change my profile pic on twitter?

[Claire]

I have been trying to change my profile pic on twitter for a couple of days (both from my phone and on the computer) and it wont let me. Does anyone know why I cant change it?
I have done that but everytime i click save it goes to 'internet explorer cannot display webpage'? When I try to change it from my phone it says photo cannot be uploaded?

[Rishana Jobs]

Try to:
Log in to http://www.twitter.com
Click on the person icon and select Settings from the drop down menu.
Click on Profile (the fifth tab in the settings navigation bar.)
Click the Browse button next to your profile image.
Select a file to upload.
After selecting the file, click Save at the bottom of the page.

[Rehman Asghar]

i don't know