The general scheme for all services is: 1) In Site Settings you choose the service and fill all necessary fields out; 2) Go to your Website Page, add block with a form and choose the service in Block Settings; 3) Publish the page.
You can also use your own script which will capture data from contact forms linking to it in the "Block Settings". Data is transmitted via the POST method. The names of alternating fields can be changed if required in the "Block Settings". Data can also be transmitted without refreshing page (AJAX).
Click to go to the certain service instruction page.