How have you done this?
Is the front still attached and have you got the right hand side panel remove?
Ok if you have the belt round the drum refit the front panel of the dryer and leave the right hand side panel off. This will place the drum in the correct place from there.
Now i dont know if you have remove the fans yet but if not then look at the right hand side and there at the bottom to the right of the motor you will see a plastic cover.
Remove this cover and there you will see the fan. Remove the fan and then you can slide the belt onto motor shaft and then you can feed it inbetween the pulley wheels. Its sits like a V shape inbetween the 2 pulley wheels.
Then you can refit the fan and fan covers from there.
Try that and let me know how it goes.
Just wondering how you got on with the dryer as i havent heard back from you.
Did you managed to sort it?