I feel like learning the 'correct' or generally accepted terminology will help your case more than anything right now.
At your cranks/bottom bracket.. There are (generally) four main pieces.
The Pedals. These are what you put your feet on, to push down (or pull up if it applies).
The Cranks (crank arms, if you must), which are the lever-arms that the pedals are screwed into. There are two of these.
The Chainring. There are usually either 1, 2, or 3 of these. In this forum, you'll find there is only 1. This is the big ring, attached to (usually) the right Crank Arm. It has teeth. The Chain goes on this. It is most commonly attached by Chainring Bolts (usually 3, 4 or 5).
The Bottom Bracket. This is generally attached to the bicycle frame. It is generally either sealed or looseball, but the spindle is the part that spins. This is also what the cranks are fastened to via bolts in one fashion or another.
Now, this is the basic 3-piece crank design. There is also the 2-Piece crank (which is found on more expensive bikes) and 1-Piece crank, which is the cheapest to manufacture. In this design, the Spindle, and both Cranks are all one solid piece of metal, bent to shape.
Your initial post would lead me to think that the Bottom bracket is not correctly tightened, and it is not an issue of the crank-spindle interface, but more of the bottom-bracket bearings to spindle interface. Your second post is rather difficult to decipher.