How do you add logo in wordpress site?

You'll need to upload the new image you'd like to use (using FTP) to your blog's directory.

Then change the image URL in the code instead of the existing logo.

There is also a second option.

go to you dashboard - navigate to media- click on the media link- click on add new next to media library- locate your image on your computer or externally- select file- save changes.

from there you can add your logo to your site by selecting media as mentioned above but this time the logo will be in your media library already.

There is nothing wrong with using (ftp) but if you don't know how to do it, it can get a little complicated.