Replace a fuel line in a S25DA Poulan Chainsaw?

I was given the above saw with no fuel line, but has the tank filter. Is the fuel line one piece that runs from the tank to the carberator? If yes, how do you actually thread it and where? I have a new correct size fuel line, but can't get it into the tank through the hole, as well as the two other holes I have seen. Any suggestions there? I was told not to take the tank apart.