There is no problem – browser or other: in the Visual editor, the link button is always greyed out when you haven’t selected any text. First you write the word or phrase that will work as the link, then you highlight it, then you click the link button and add the URL.
PS Please search the Support docs and the forms before posting questions on standard features or functions.
I realized it was that I needed to change to the text editor. Thank you for the response. Just to let you know I did search the forums before posting ,,, always do. Didn’t see anything current, but may have missed something.