Hi @ckle 
Thanks for your question. Depending on how you made your donation, there are two places to check for donations:
1) If you make donations through your employer or pension, you will need to check your income tax slips; T4, T4A, T3, T5013 slips; or partnership financial statements.
2) if you have a donation slip sent directly from a charity you will need to manually enter these under the "Charitable Donations" section

Your total charitable donations will be available on your summary before your file.