I have seats 6A and B where on the plane are they on Air Canada 789. Not sure where these seats are, as they were booked for me, does anyone know where they might be.
To make this potentially useful for other people, I'm interpenetrating your question as "how can I find a seat map of a specific flight".
Most airlines offer seat amps online on their web sites. A very good resource for this is also seatguru.com.
When you enter your information, make sure you are as specific and correct as possible. It's not unusual for airlines to use different aircraft for the same flight number on different dates either based on season or weekday.
Rows are numbered from the front to the rear with row number 1 being in the front. Within a row seats are lettered from left to right: A, B, C etc. Please note the rows and letters are not necessarily consecutive, i.e. some row numbers or seat letters may be missing depending on the layout and type of the specific aircraft