First of all: This is
clearly a Support question (I've requested for it to be moved to the Support forum).
Moving your board to a new location isn't difficult at all.
But before we get to that , you should find out which version of phpBB you are using + modifications? extensions?, styles, etc...
Please post the Support Request Template
to give some more information (avoiding probably a lot of unnecessary questions).
BTW board version and php version can be found in the ACP.