Yes, very easy... if you already have ATX tokens... which I know you have. All you need is to have SWAP.HIVE too. Then you can add liquidity here:

https://beeswap.dcity.io/pools/add?pool=ATX:SWAP.HIVE

Example for the ATX:SWAP.HIVE pair, but any pair works the same way.

You can also remove liquidity at any time (and its instantaneous). But remember that on pools where there is bonus (like the one above), every time you remove liquidity, you loose the respective bonus associated with the amount you remove from the pool.

I have a triplet of posts explaining all these things... this is the first one:
https://peakd.com/hiveengine/@forykw/understanding-liquidity-pools-on-hive-engine-into-basics