Urgent Advice - Amending details in application submitted online

[dominionmarvel]

I was fined for driving on the bus lane back in October 2018, but I haven't received the penalty charge notice because of address changed. After one year, I received a letter from Equita enforcement Limited informing me about my penalty. I am not sure that is this letter from the court or not but, I paid immediately.

After submitting the Tier 2 extension application within UK and paying for the fee (However, biometric is not booked yet), I realized it might need to be mentioned under convictions and penalties, but not sure under which?

Q1 - Am I convicted of any of the points mentioned below in visa application form?

At any time have you ever had any of the following, in the UK or in another country?
- A criminal conviction
- A penalty for a driving offence, for example disqualification for speeding or no motor insurance
- An arrest or charge for which you are currently on, or awaiting trial
- A caution, warning, reprimand or other penalty
- A civil court judgment against you, for example for non-payment of debt, bankruptcy proceedings or anti-social behaviour
- A civil penalty issued under UK immigration law

Q2 - If yes, under which should I be liable?

Q3 - What is the way to change the current application? as its already submitted

I have received different advice to write a cover letter. Some are saying to put a new application and pay the fee again.

Q4 - If I make a new application, what is the procedure to cancel the existing and refund?