How do I change my contribution amount?

From your paycheque 

You can change your contribution rate by logging into your account and clicking "View details" below the current contribution amount. Then press "Cancel" and confirm that you want to stop your contribution. Next click on "Start contributing" on your dashboard to reset your payroll contributions. If you make a change to payroll contributions, your employer will receive any changes you’ve requested within one week of your request. Changes will be dependent on your company’s payroll cycle and timelines. 

From your bank account 

If you're contributing from your bank account, in addition to payroll deductions, click on "View details" below the current contribution amount and press on "Edit" to change your monthly contribution. For those without payroll contributions, the "Edit" option is right beside your monthly contribution amount. Note that there is a month-end cutoff for any changes you make. Transactions marked as pending in your “Upcoming Transactions” section of your “Contributions” page can no longer be updated or changed.