The Register of Electors for 2018-2019 was published on 1 February 2018 and comes into force on 15 February 2018. You can check to see if your name is on the Register.
If you are eligible to vote but are not on the Register of Electors, you can apply to be included in a supplement to it, using Form RFA2.
If you are on the Register but have changed address, you use form RFA3 to apply for inclusion on the supplement at your new address. This will also remove you from the register for your previous address.
You can apply at any time. However, you can only be included in the supplement used at an election or referendum if your local authority receives your application at least 15 days before polling day. Sundays, public holidays and Good Friday are not counted as days for this purpose.