It depends on the make of the AEG; "Tactical" is not a brand.
Most likely you have a Kraken or some other TM knockoff, and you can take off the foregrip by;
1) Flip AEG upside down so you're looking at the bottom of the receiver;
2) Look at the barrel where the gas block sits, there will be a small phillips heads screw;
3) Unscrew; and
4) Slide the whole gasblock/tube assembly forward, you can now remove your foregrips.