Instruction to: "git remote add origin" fails when existing repo already has an origin

Summary

In procedure for for copying from an existing GIT repo when creating a new repo, the nstruction to: "git remote add origin" fails when existing repo already has an origin.

Steps to reproduce

Create a new repo.

Follow instructions provided to change the origin of the existing repo.

If the existing repo already has a remote origin, then the "git remote add origin ..." step fails.

The instructions should indicate that it may be necessary to "git remote remove origin" before the "git remote add origin"