Hi Christina,
In 1900 switch where there is a menu option there is an option to enable port fast mode under Port Configuration Menu
Have a look at this link
http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v9x/28icg9x/28icoutb.htm#xtocid1786318
If you have 1900 switch where you need to configure port fast you can use command " spantree start-forwarding "
Use the spantree start-forwarding interface configuration command to enable Port Fast forwarding mode for a nontrunk switch port
Have a look at this
http://www.cisco.com/univercd/cc/td/doc/product/lan/28201900/1928v8x/eecli8x/clipart2.htm#xtocid39
This command is similar to spantree portfast command in other high end switches.
HTH, if yes please rate the post.
Ankur