To setup you Tplink extender with Bell router you need to Follow these steps :
At first you need the password of Bell router that help you in setting up your extender.
2. Plugged in your extender nearby your router and then wait for 3 to 5 minutes .
Press the WPS button on your Tplink Extender for 5 seconds and within 1 minute press the WPS button on your Bell router for 5 seconds and wait for 5 minutes .
When you see all solid light on your extender then go to your computer or mobile phone and then go to the wifi over there. Where you see Tplink extender in the list. Please connect your you devices with this network and put you Bell router password ( If it ask for the password) . once you connected with that network then check internet is working fine, if it is then your extender is configured properly. Now if you want you will able to move your extender where ever you wanted.