Don't click on changes .. go straight to avatar
Click your little avatar on the top of the page and when it's open scroll down to avatar and click it .. then you get the option to remove or replace
On the top of this page ( I am using my iPhone with this) you will see the little picture you have now as an avatar... click on that and a big drop down menu should appear .... yes/no ?
O ... are you using the app or the main site ... just had a look at the app and finding it difficult to find the avatar myself .. can you get to a lap top or load the web browser for the forum
can you search on line for http://www.diabetes.co.uk then sign in to the forums . then follow the info on clicking the avatar and change or delete your avatar
On the top of this page ( I am using my iPhone with this) you will see the little picture you have now as an avatar... click on that and a big drop down menu should appear .... yes/no ?