I have entered the info on my T3 slips but also have a T3 Summary of Trust Income and I don't know what to do with this information
You receive a T3 Statement of Trust Income Allocations and Designations if you have investment income from mutual funds in non-registered accounts and from certain trusts. The income may come from your own investments or from an estate trust as inheritance tax. If that is the case then you need to fill out a T3 Trust Return, which is separate from your T1.
More here from the CRA on a T3 Trust return: https://www.canada.ca/en/revenue-agency/services/tax/trust-administrators/t3-return.html