Someone else using my broadband connection

[#1]

A friend of mine who is coming on a visit would like to  bring her PC laptop to do some work while staying with me. Will she be able to plug into my plusnet broadband connection? I have a BT Voyager 210 Modem/Router from plusnet which also has a yellow ethernet cable. It is 5 months old. 

[#2]

Yes - if one of you uses the USB port and the other the ethernet port

[#3]

but dont forget it will go on your bill, you should try and use the yellow cable at all times it is a lot quicker than USB

[#4]

Thank you very much to both of you. I shall bear that in mind.