I have just done my piston rings but now its pushing oil through the dipstick tube don't know why

Smoke from the dipstick tube is potentially bad news especially if it puffs like an old steam train.

Clearly further checks are needed to make a complete diagnosis but the initial indication is a problem with a piston or pistons or broken or badly worn piston rings allowing an excessive amount of combustion gas to escape into the crankcase.

Commonly this is due to excessive pressure building inside the crankcase cause by compression blowing past the piston rings in one or more cylinders

You should first have a compression test done on all cylinders.

Don't delay in having this problem checked out.

Those are usually the symptoms of blow-by. This is frequently caused by worn or broken piston rings, damaged cylinder walls, or (infrequently) a severely damaged piston. Blow -by is pressurized air from above the piston (that is, in the combustion chamber) leaking into the crankcase and escaping wherever it can; the oil fill opening, the crankcase vent air inlet, or the dipstick tube are the usual places where it is noticed. It generally indicates relatively major engine problems.

You have a problem with the rings that seal the combustion chamber from the crankcase .
Try replaceing the PCV valve but I think the problem is much bigger then that at this point its kind of late the damage it done .

I would look for other leaks. If you are sure it's leaking at the dipstick tube, there is normally an o-ring where the tube presses into the engine. In general, this is an odd place for a leak, as ther eshould be no oil pressure in the pan (where the tube terminates) and unless the engine is overfilled with oil, the tube end shouldn't be immersed in oil to leak. IF there is pressure in the oil pan, that generally indicates bad rings. I have seen engines where the oil dipstick actually pops out of the tube under pressure when the engine is running due to pressure in the oil pan from blow-by at the rings.

Excessive compression loss past worn piston rings into the crankcase .

oil pumping out of the dipstick tube? you are getting pressure in the block from compression somewhere..bad rings usually cause this unless the pistons have issues..like tops burned through or broken by busted or stuck valves..

there shouldn't be a filler tube, just a dipstick tube for checking the oil level. to put the oil in the engine, there should be a oil cap on the right hand side valve cover. if the dipstick tube isn't there, you definitely need to get one from a parts yard or store, you can be losing oil from the dipstick hole that goes to the oil pan...

Your engine breather system is blocked....this means that the only way that the compression caused on ignition that is getting past the piston rings and into the block can escape is via the dipstick tube.
Check breather for kinks and some have filters ensure that these are not blocked

depends how far up the break is!