Text widget uneditable and unremovable

I inadvertently added code to a text widget that I now cannot edit or remove.

Please have a look at https://itsonlycode.com and you’ll see (2) skyscraper ads for amazon…

I’ve looked in both the left & right.php files, and all the rest of the files for the heck of it, and cannot find any entry except for the hard code for amazon that I added in the left sidebar

I’m still trying to learn my way around wp and would hate to have to lose the posts I’ve already made if I’m forced to reinstall or whatever

As always – any help is greatly appreciated!