I know what pago, po ver, lo que he and perdido means

If you know that, you already understand the sentence.

por ver mean to see

Correct

lo que he mean I have perdido- lost. But - he perdiodo - mean I lost.

"Lo" is generally translated as "the thing", but if it is followed by "que" (="that"), and you can replace both and still get a similar meaning, "what" sounds much better in English (if you can't make this replacement, don't use "what").

You are saying that "he" is "I have" and "perdido" is lost, so "he perdido" is "I have lost".

Can you put all the pieces together now?

Another por/para problem for me.

Why is it "por ver" and not "para ver" in this instance?

Is the meaning of por ver "because I wanted to see".

Another por/para problem for me.

Why is it "por ver" and not "para ver" in this instance

There is no problem using "para" here, as it is indicates the goal, so "I pay in order to..." is fine too, but there is a subtle difference which is hard to explain.

"Por" here can be understood in two different ways: to provide the reason why you pay, or as an exchange (payments are exhanges too: goods for money), as in "I pay, and someone else gives me something in return".

"Por" and "Para" are sometimes interchangeable, especially when your goal and the reason why do you things are the same thing.

Eddy...the agua is not very clear where i come from...so you make me confused...