Whether or not you're a member, you can give to St. Peter's online via Access ACS. 

If you're a member, click the link and enter your login information as usual; nonmembers and friends of the parish can donate after setting up an account.

Once you have signed on to ACS, pay your pledge via the "General Fund."  You can also donate to Music at St. Peter's and the John Shelby Spong Lecture Series by selecting those options