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join path issues
Hello there guys im new to illustrator and using CS6 most things I have been able to step around with online tutorials etc and Im learning as i go but some things are just annoying me and I need to sort a way around them asap.
Most of my illustrator work is quite simple and used to cutting paint masks for airbrushing, logos etc. On top of this I need to create borders for certain cuts and this is today’s problem, I have 2 border corners placed into my work space and id like to have them joined on the screen so they cut as a full side and it saves me from manually having to mask and join the edges which takes time and is not very easy when the lines are so small, I have tried using the scissors and cutting the line then deleting the 2 new points and then selecting the 2 paths and clicking on join. This worked on one of the lines but for whatever reason will not work for the second.
I know there are a few different ways to achieve the same thing in Ai but this is confusing the hell out of me and I need a way round it.
Please help.

Thanks
Jeff