How do I change my username? There is no option to do that in account settings.
If you click on your profile, could you see a small pencil close to your username?
If not, just tell me which username you would like, check that it's available in the search engine.
I will edit it for you.
There is a pencil besides Profile Picture. Not username. Please help me change to khteh Thanks
Done 
Welcome @brucewilson3. If you let us know what you want to change it to we can help.