How do i place fuel adapters in a symmetrical position or however you say it?

@KraZIvan Yes! Thank you.

With the fuel adapter selected press "x" and it will symmetrically add up to 6 fuel adapters. To add more than 6 you can grab another fuel adapter from the parts list and press "x" again for that one as well. To line them up correctly with the fuel tank or fuselage I turn on the CoG and use the lines coming off the sphere to help me line them up.

As far as the translate tool I'm not sure what you mean, select the part you want to move with translate tool, and use the arrows to move the part in the respective axis, you can also use it to move a whole assembly or only the part in question. Translate tool is most useful once you have attached a part to something, otherwise it's jsut easier to drag free parts around. Is this what you meant?

@Bmcclory I mean the fuel adapters, i place them on the fuel tank but they are not in a symmetrical position, so the craft falls over when i launch it.