If you make a donation to a charity through your company, you can reduce the amount of Corporation Tax you have to pay by claiming the donation as an expense. You can read more about donating to charity through your limited company in our Knowledge article.
To record company donations in Crunch, select 'Donations > Charitable Donations'.
If you want to make a donation personally, do not record it as a company expense. Instead, record it on your Self Assessment so you can take advantage of the personal tax relief.