How do you start to accumulate WHZ$? Do you have to be an uploader?

[Fatima99]

you could go and play in the Contests Section and win WRZ$ - most of the contests are very easy but make sure you read the rules first

viewforum.php?f=2

How often does a contest take place?

How often does a contest take place?

There are a lot of contests happening daily.
Some have a 24 hour time window and some could have 15 or 30 minutes windows to play.
One of the contests that could earn you WRZ$ everyday, almost certainly, is Show Me Yours: https://forum.mobilism.me/viewtopic.php?f=2&t=1642695 where you post a photo taken by you recently, and given you follow the rules, you can earn 50 WRZ$ each day!
There are variety of other fun and interesting games going on at any given time! Just make sure you follow the rules and it'll be fun!