Joining to Horizonflans is pretty easy with technic launcher!

Step 1:

Install technic launcher

Step 2:

Log to it with your minecraft account ( For cracked minecraft accounts, use cracked technic launcher where you can just type your username )

Step 3:

Click "Modpacks" and copy-paste this link:

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https://www.technicpack.net/modpack/horizon-flans-a-new-dawn.1334470

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 in the search bar

Step 4:

make sure you have the right "official" modpack, 

That is how it should look -------->

Step 5:

Click "Install"

Step 6:

After installation is ready, just click "play" and you are good to go!