You can find instructions by typing in www.hi-pointfirearms.com or simply typing in Hi-Point Model CF on the search thingy on your computer.
The CF model is the newer one with a one piece polymer frame.
An older model I believe had an aluminum alloy frame with plastic grips held on by a single screw each.
On whichever model you have, look at the back of the slide.
There you will see a round ball looking thingy. This round ball holds the slide in place and guides the slide in it's trip sliding back and fourth. This piece is the key to removing the slide. Lift the slide up just high enough for the slide to clear the ball. Not now. After the next few sentences.
Do not lift slide higher or else you break the gun.
To remove the slide, (the barrel cover)...
remove magazine
pull slide back to verify no live round is in chamber, then...
carefully pull slide back until it stops, then lift slide up like 1/4 inch...
then push slide forward off frame.
On the older model, you can also remove the screws holding the plastic grips on the hand grip to clean parts.
You can do a good to marvelous job cleaning the gunpowder debris and other stuff now.
I recommend not taking the handgun apart any farther unless you have a good schematic and assembly/disassembly instructions.
If you are unsure of your gunsmith abilities, you can do a good job by simply making sure firearm and magazine do not have any ammo.
Remove magazine.
Lock slide back.
You can now clean the chamber and barrel, plus the magazine well, (or where the magazine lives and works at with magazine removed from rest of gun).
To clean the magazine, (or clip), with the thing containing no ammo, simply remove the bottom; the spring and follower (the thing the bullets lay on) come out through the bottom. And then you are left holding the magazine body itself. Clean. Oil lightly.
Reassembly is the reverse of disassembly.