How to log in to my official imdb account ?

Hi, Mirjam Thorkelsdottir.

Please follow the official guidelines:
https://help.imdb.com/article/imdbpro/manage-your-imdb-page/claim-your-page/GXWAJBBV8EVPF3PE?ref_=helpsrall#pageclaimed

Mirjam

As long as you are a registered user as described by Tom above you can add data.

See instructions here.
Adding Filmography credits
This explains how to add those director credits.

The other two persons here have mentioned IMDb Pro
This explains the advantages of having it.

What is IMDbPro?

This explains what is included with your membership,

What's included with an IMDbPro membership?

If you have any further questions, please ask.
Cheers
:):)
Ed