Hi im wondering if someone can help me please..................

Im currently using a Macbook pro and a 1 TB time capsule , I have 2 0ther MS PCs connected to a BT home hub , Im no expert on computers hence me asking for some advice here .....I connect no problem to the home hub but the minute i try and attach the time capsule , my laptop finds it attachs it but then i have no internet connection , again reset my interent connection and i loose the time capsule , I know im doing something wrong !!! but not sure what it is ? anybody help before i have no hair left