Board Thread:Support Requests - Getting Started/@comment-28408407-20190525113435/@comment-9605025-20190525235943

I second Applemasterexpert's advice; I can almost guarantee it will fix your issue. The "insert" key is one a lot of people ignore but is there and every once in a while people hit it by accident and have no idea what is going on. For example, in this other recent thread. - Edit:

The reason why a decent number of programs don't allow you to click between characters and highlight them instead is so that it is clear which mode you are in. The typical mode (where the cursor is between characters) inserts new characters between existing ones. The alternate mode replaces the highlighted character with the new character and then advances to the next one. In other words, the alternate mode allows you to overwrite the current text instead of inserting new text and then separately deleting the old text. Sometimes, when using a site's login, it will warn you that the key is active; similar to how some site logins warn you that caps lock nor num lock is on.