At the command line:
git clone <url-to-your-fork-of-helpafamily-here>
cd helpafamily/
cp .env.example .env
yarn install
In your .git/config, add these 3 lines:
[remote "upstream"]
url = https://github.com/margaritahumanitarian/helpafamily-manual.git
fetch = +refs/heads/*:refs/remotes/upstream/*