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Click on the three horizontal line logo and then click on your profile when you profile is open there is little pencil type logo on your name click on this pencil and edit your username and you are done.
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If you want to change the profile name then go to your profile, there is an edit button on the left from where you can change it. But if you want to change the profile name in the URL, It is very strange that you cannot change it from the web. At least I am not able to find it. But if you have a tripoto app, go to your profile, there is a "Handle" label , from where you can change it. Happy travelling :)
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