invalid username or password

On the advice of github last week via email I changed my password for access to my repository (https://github.com/BlueFern/) . I was successful with add and commit but when i tried git push I got this error

highp-tda21:Code_Description timdavid$ git push

remote: Invalid username or password.

fatal: Authentication failed for ‘https://github.com/BlueFern/uncertainty-quantification.git/

highp-tda21:Code_Description timdavid$

Can someone please tell me how I can get past this ?

Hi @tda21 Thanks for being part of the GitHub Community Forum!

If you have a question about your private account details (like your username or password), you’ll need to reach out to private support at https://github.com/contact. For security and privacy reasons, we can’t discuss your private account details in this public forum. We’ll be better able to help you via our contact form.

Cheers!