Copy the link code and insert into your <head> section of the Base.
Start using it in your design, by copying the CSS rules for the font-family into your CSS in the various places you want to use it in your Base and Blocks.
Custom hosted fonts
Adding a Custom hosted font, is very similar, however Alpaco offers to host it for you:
Open your Alpaco Account
Navigate to Assets Manager in the top menu
Upload your font where it says "Drop files here or click here to upload"
When a font is uploaded it will be indicated with a "Aa" icon.
Click the font that was uploaded and insert it your <head> section of theBase using the @fontface method of declaration.
Start using it in your design, by copying the CSS rules for the font-family into your CSS in the various places you want to use it in yourBase andBlocks.