Everyone with a Wikipedia account has a User page. And all User pages have their own Talk pages. This is where you can engage directly with a particular editor. They will be notified if you leave a message for them on their personal Talk page.

Your User page can be found in the upper right menu bar on Wikipedia whenever you're logged in.

Open Wikipedia in another tab, log in, and click on your username. This will open up an editing window to create the new page. Try copying and pasting this sentence into the editor:

I am part of a course taught by Wiki Education that trains scholars in how to edit Wikipedia. Learn more at wikiedu.org. All of my contributions are my own and I take responsibility for them.

When you're done, type a summary of what you just did where it says "Edit summary" at the bottom of the page and click "Publish changes".