Hello,
Am I able to change this such that the user only sees the login form, and a link to create account below that, which will lead to the registration form once clicked?
The solution will probably be to set the "Display method for registration" option to "Switcher" and the "registration" option to "registration", then your customers will be able to select if he want to login or register.
Note that the Registration / Display method for registration options are only available through Hikashop commercial versions.