Help! Blog button troubles. LOL

Trying to add a button for the first time.

I am following the directions from the lovely Holly.

I got as far as entering the code along with my photo from photo bucket.

I click my photo as you can see in the picture below then click the hyperlink, where my cursor is pointed.

 When I click the hyper link this message pops up.

An error has occured in this dialog.

Error: 100

Function expected.

What does this mean? What am I doing wrong? Why am I so computer illiterate? I used to know a lot but I guess I do not no much about the more update computer stuff.

Thanks for you help!

Whitney