Hey there @grexx

Just sign up using your steem-account at https://www.splinterlands.io
You could also use a referral link for signup https://steemmonsters.com?ref=criticalthinkin

Afterwards, you will receive a free starter set of cards (note: they won't be tradeable)
and can simply start playing. But watch out, it is quite addictive xD

If you need any further help with the signup or want some beginner tips, hit me up on discord:
criticalthinkin
#7216