Help me donate to the Lewy body dementia society

Hello. My name is jack, I am 12 years old and am trying to raise money for people who have an awful condition called Lewy body dementia. Basically it messes with your brain and makes you forget important things. 
Unfortunately my grandad had it and passed with it a few weeks ago. He had it for almost 4 years.

To raise the money I am going to walk 7500
Steps everyday.