Stupid auto line in Word..

[Hessah]

You know how in word, when you do a series of underscores on a new line like:

___________________

When you hit enter, it automatically forms a long line under that text..

Anyone know how I could format this line? (this is a line where you can't back space, but you can only move it up and down using arrows)

my 1st question is: how do I delete a line? I had one that just kept moving up and down but i couldn't delete it no matter how I try to back space and hit delete around it...

my 2nd question is: how do I change its thickness and make it sit where I want it to sit?? There's a link at the end of the paragraph at the moment, but we wanted it under the header of that paragraph..

HAALPP~~ It's driving me crazy!

Thanks