i would like to know how to get credits

 Kill mobs, if credits don't drop, keep trying, it's a matter of patience.

is it back up???

it takes ages to get a tardis when u43 is completed when you go on to the server can you already have a tardis

 no it isnt its for purchasing things you want

saying that i find crafting hard

great server

 use grammar please and no, that wont be added, TARDIS are expensive becuase they cause lag

There is a glich were the demat lever doesnt work. Any idea how to fix it?

 If you disconnect from the server and rejoin, or if you wait, one of the two should help.

If not, I recommend looking at issues similar to yours posted in this section: Bug Reporting