I'm throwing my roku in the trash an switching service. I have to reconnect my remote about every other day then it just stops working so I go by new one an it works worse then the first one so I ordered a new on from roku themselves an wow even worse then the first two by not ever working at all has no pairing button an will no pair even with new battery so yeah . [post edited]
What model device are you trying to replace the remote for? If your original remote had a pairing button and the new remote does not have a pairing button, then it is the incorrect remote as it is an IR remote which will not work if your device requires an enhanced remote with a pairing button.
Please let us know what device model you have so we can recommend the appropriate replacement remote that you will need.