There are two parts to the enrolment and application process.
1) The first part is the CLLI APPLICATION Form, here: http://clli.centre.uwi.edu/registration.  This is to reserve your place in your courses of choice and on hall. 
2) The second part (for non-UWI, St Augustine students) is the UWI, St Augustine REGISTRATION.  For non-St Augustine students from other campuses outside of T&T, this assists with immigration matters and all other administrative matters.  All non-St Augustine UWI students need to register on their own campuses before proceeding to St Augustine.  For non-UWI students, this is to ensure that you are a registered student with a UWI ID number.