Login to MailChimp, then go to the dash board. In the navigation, click 'Create', then Click 'Signup From'. (see image below)
Select embedded form, then press 'Begin'. Then select 'Horizontal'.
Note! You do not have to edit anything else about the form, because it will be overwritten to fit within you BioLinky page, and use your custom color etc.
Just copy the provides code block. (see image below)
Paste it within the MailChimp settings in the BioLinky settings page.