Unable to enable Port forwarding to speed up Torrent speed,plz help!

Hi all:
I read somewhere online, that I should enable certain ports for TCP/UDP to speed up torrent speed. This is what I have done:
-log into my router by going to
-goto the port forwarding section.
-add service, and in TCP/UDP, add in ports ranging from 6881 to 6889. But when I click apply. It says "Port conflict with other service. "
Any idea why this is the case?
Oh, I entered the correct internal IP, I ran cmd to check my own ip address.
Any help would be greatly appreciated, thanks!!

For my torrents i only use one port and it works fine. Try picking just one port and see if it helps.