Digital Signature via the Cloud using Trust Service Provider

Seaglass18

Hello, 
I am currently applying to a remote role (that will be freelance / self employed position) and, having gone through a number of hoops to get to this point, their HR team have sent me an Acrobat document to sign. The signature has only two options:

Option 1: 

Cloud Signature

Sign online with a Digital ID hosted by a Trust Service Provider.

Option 2:

Download and Sign With Acrobat

Sign locally with Acrobat using a smart card, USB token or file-based Digital ID.

I don't have a Digital ID signature to use for this one-off purpose as I cannot remember signing anything online before and their advice as I am UK based is to use GlobalSign.  I have been on the Globalsign  website and cannot see how to create my signature or download what I need.  

There are other named options on their dropdown list but I am cautious about security.  After a significant amount of digging it seems several options have a cost involved. 

A former colleague suggested ZealiD to me but at the moment these are just names and options floating about and I have spent half the day trying to work out how to get this done.

The 'employer' is global and I can only submit a ticket to get advice and I'm not sure they will have an answer.  Hence coming on here to see if anyone else has experience or can point me in the direction of a secure option that ideally is free or low cost?

Thank you for reading this and any help or insight would be greatly appreciated.