There is a daily limit on the number of times you can donate to Alliance Research.
You gain one new donation attempt every 10 minutes.

Donating consumes resources (such as wood or food), which are shown on-screen before confirming the donation.
Once you run out of donation attempts, you can either wait for more to regenerate or use Diamonds to donate immediately.

When you donate:

The selected research gains Research Points.

You earn Personal Points.

The alliance gains Alliance EXP.