There are two common issues.
Firstly make sure you are logging in through the log in link and not through the sign up form.
Secondly please make sure that arrive on this page and enter your email address and password.
Make sure you do not put any spaces before or after your email as this can make it not recognised. And be careful not to use unrecognised symbols as that will also cause it to fail.
If the page refreshes back to the page above then if you click this link it should allow you to login without problems.
For Kalme website please use this link
For Skin Shop please use this link