https://www.canada.ca/en/immigration-refugees-citizenship/services/application/account.html
step 1: create a Mycic account (GCkey signup) using the above link ( following the instructions while creating account and i suggest to write down all the security question and answer at a safe place so that you do not forget what you typed there)
step 2: 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 3: upload all the forms once filled,your photo and documents etc whatever is requested in your Mycic account
Step 4: once everything completed Submit your application for processing.
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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.