From the site that you mentioned (How to apply for long term study visa - Immigration Service Delivery), it seems that it is not really a form but a letter (I emphasized the relevant part in itallicitalic):
Documents Required
[...]
Application letter
Your letter must include your full name and postal address, and the:
- Reason you want to come to Ireland
- Dates you plan to arrive and leave.
Your letter must also include a commitment from you that you will:Your letter must also include a commitment from you that you will:
- Obey the conditions of your visa in fullObey the conditions of your visa in full
- Not rely on public services (for example, public hospitals) or become a burden on the StateNot rely on public services (for example, public hospitals) or become a burden on the State
- Leave Ireland before your immigration permission expires.Leave Ireland before your immigration permission expires.
Application Letter
A signed letter of application including your full contact details:
- Outlining your reason for wanting to come to Ireland
- giving details of any members of your family who are currently in Ireland, or any other EU Member State
- Undertaking that you will observe the conditions of your visa, > that you will not become a burden on the State, and that you will > leave the State on the expiry of your permission to remain, and
- Where the course you now wish to study does not naturally follow on or relate to your educational/employment history, giving valid reasons, supported by documentary evidence (where available), for this change.
