If you no longer wish to contribute towards the bills from a supplier you are able to remove yourself from future bills.
To remove yourself from a bill go to your timeline and click the drop down arrow on the right hand side of the bill alternatively go to the packages page to remove yourself.
If you setup the account you will be unable to remove yourself. You must contact the supplier to request the name is changed to another housemate. You must check your supplier terms and conditions to find out if this is possible.