how do I remove the spark plug and where is it on a 2005 Suzuki LT-A700X?

I believe the spark plug is at the auto parts store.

socket set extension

If you cannot even locate the spark plug, please take your vehicle to a mechanic.

With knowledge. A cold engine (not run for the day) is best. The bike came with a socket wrench in its tool kit. That always works.

In the cylinder head with a spark plug wrench - follow the ignition wire. IF that is not enough information - step away and have someone competent do the work.

With a socket set.