Can’t right click?

Hi Wonder if someone can help?

I'm currently using Wireshark to try and obtain my user name and password for my isp so that I can swap their router for my own. Ive looked on YouTube to see how I can obtain this. I've selected a packet and then opened bootstrap protocol. I then need to right click on option (61) client identifier. After doing this nothing happens. What I am meant to see is a pop up menu that will let me select - copy, bytes & printable text only, but this is not appearing.

Any help would be appreciated.

Thanks.