Calculation of cutoff frequency in larger circuit
LT1818 is a poor choice to run from a single 3.3V supply - you need something that is specified to run from a 3.3V supply with rail-to-rail inputs and outputs. AD8031 springs to mind.

Regarding the filtering the low frequency cut-off is determined by C6 and R6 in parallel with R5. HF cut off filtering is determined by C5 and R17.

Because it is both a HP and LP filter you'll need to spread the HP lower than 2MHz and the LP higher than 2MHz to get any decent flatness and easily predictable gain at 2MHz. Typically if HP=LP=2MHz a signal at 2MHz would be "down" by 6dB.