Due to an influx of spammers in recent weeks they changed the posting of links for new members. After you've posted a few times you shouldn't have any problem. Even a pattern name is helpful, too.
To join a new yarn you just start knitting with it and then you can weave in the ends later. If the loose end bothers you you can weave it in sooner or tie it loosely to the other yarn if there is one and then fix it later.
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