Depending on your chosen Welcome Offer, you can follow the below steps:

Casino
Both offers will show immediately after registration, where you can choose to use them on any two deposits in the first 7 days from registration.
After 7 days from registration, any of the two bonuses not activated will then expire and no longer be available.

Sports
You must claim the offer from the 'My Offers' page to activate it before placing the qualifying bet, within 7 days of registering.

The qualifying bet must be made within 7 days of registration