The most common reason the welcome offer has not been automatically added to your account upon the first deposit is that the offer has already been claimed in the past.
This is also mentioned in our terms and conditions for the welcome offer under section 2:
Only one Welcome Bonus is allowed per SSN (Swedish). This Welcome Bonus is for new players who make a deposit and are over 18-years-old. The Welcome Bonus is not open to players with a previous account at Speedy Ltd (Speedyspel)