If you are a BN(O) status holder, you will be a qualifying commonwealth citizen with leave in the UK, and therefore will have full voter rights.
If you want to be on the electoral register so you can vote in elections and referendums, you can register to vote on the government website.
Once you are registered to vote, you can vote for a local MP (Member of Parliament) in General Elections. These are usually held every 5 years. You can find your current MP online. MPs are responsible for representing the people who live in their area (their ‘constituents’). This includes helping with local problems, and speaking on behalf of their constituents when the government is making decisions.
You can also vote for your local councillors in local elections, which are usually held every 4 years. Councillors are part of your local council. They represent the people who live in their neighbourhood (called a ‘ward’). This includes helping with local problems, and speaking on behalf of residents when the council is making decisions. You can find your councillors on your local council’s website.