Hello, I have such a problem, I can not upload changes (changed files) to the bitbacket repository?

Question

Bitbucket

gave a link to the bitbacket master repository, using the sourcetree program, downloaded the site files locally to my computer from there, and didn’t touch it, but simply copied them and changed copies, now these modified files need to be thrown into the local repository, which I did, made a commit and pressed the button send, there are file changes in the master repository on the bitbucket, but I can’t figure out what to do next, I tried to look at the instructions, but it doesn’t work, what else needs to be done so that the changes are visible on the site itself, please help
What is:
1) there is a link to the master repository from which the site was downloaded
2) there are changed files that need to be uploaded
3)
I just want to upload the changed files to the repository, the files are uploaded, the commits are made, everything is visible on the screenshots, I can’t understand what else needs to be done so that the site displays these changes