if you want to appy online to extend your stay in canada, these are the steps:-
YOU CAN START FROM HERE: cic.gc.ca/english/visit/extend/visa.asp
First determine your eligibility to apply online (cic.gc.ca/ctc-vac/getting-started.asp)
step 1: Fill out the complete questionnaire
Step 2: on the completion of step 1 you will get a CODE, Write it down on a paper
step 3: create a Mycic account using the above CODE ( following the instructions while creating account)
step 4: Based on your questionnaire you answered in step 1, your Mycic account will automatically be consisting the application forms which you have to submit ( download them)
step 5: upload all the forms,your photo and documents and pay your fee in your Mycic account
Step 6: once everything completed Submit your application for processing.
-uploading supporting documents: scan them all, paste them in a word document file and upload them.
-After submitting wait for the outcome, they will notify about any updates in your Mycic account by sending you an email.
-Applying online will save your time as paper applications have longer processing times.
Hope it helps.