Where and how to input my shelter cost?

in the previous years, I need to input my shelter expenses on certain form, which I forgot the name.

Troubleshooting

Do you mean rent payments?  Which province do you reside in?

Troubleshooting

thanks for answering me! I live in Toronto, Ontario

Troubleshooting

The name of the form you want is ONBEN. 

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Troubleshooting

You actually can see the link to the ONBEN form in the "Your Taxes" section of the software.