If there's a chance you won't be able to get to the polling station on election day, sign up for a postal ballot and the council will send you your ballot through the post.
You can apply online to vote by post at all elections in England: gov.uk/apply-postal-vote
If you prefer not to apply on-line, you can apply using a paper form which you can download here and return to your local Electoral Registration Office.
Electoral Services
Havant Borough Council
Public Service Plaza
Civic Centre Road
Havant
PO9 2AX.