To login on your account on www.knivesfromeurope.com or www.knivesheaven.com, follow the steps in the video below. Of course you need a registered account on the websites you are trying yo login. If you not already have an account on one or both of mentioned websites, just first take a look at this tutorial.
To login on www.knivesfromeurope.com just click on this link.
To login on www.knivesheaven.com just click on this link.