Git with source tree

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I am new to git and using sourcetree. I created a branch to work on, but while working
several updates were made and merged to the master branch.

Now I want to merge the updates from master to my branch. I clicked fetch to pull changes from the server. how do I actually merge the changes now?

What I have tried:

I fetched the changes from the server, but didn't do a pull. I am not sure, if i do a pull, where would it merge the changes. do I have to be in my feature branch.