Take a sheet of beeswax, the kind you roll up to make a candle, (as that is what you are going to do).  Cut a length of wick (Or you can use twine, but proper candle wick works better.)  1cm longer than the width of the wax sheet.  Write the wish you have on a piece of thin paper (smaller than the beeswax sheet) using these or similar words:
 

 "My wish is this:
 ..............(write your wish)...................,
 For the good of all, and if it harm none
 Please Goddess, grant me this wish.
 It is my will, it shall be done!"

Place the paper in the centre of the wax sheet. If you wish, you may also add herbs or oils suitable for the type of wish you have to the centre of the wax sheet.  

Place the wick at the end you will start rolling from, and fold the wax over the wick.  Begin rolling the sheet as tight as you can including the paper, to form a candle.  Making sure that the wick pokes out about 1 cm from the top.  Light the candle and say these or similar words:
 

 "Goddess, as this candle burns,
 Grant my wish, for it is true.
 With perfect love and perfect trust,
 I send this wish up to you."

Watch the flame, and imagine the wish floating up to Heaven with the candle smoke.  You can burn the candle completely now, or you can burn it for a few minutes each day until there is no more candle left.  

Let the Goddess have time to work on the wish, and if you do not receive your wish, maybe it was never meant to be or maybe you need to think about your wish again and repeat the spell.  Sometimes what we think we want and what we really want are 2 different things, so thinking about the wish again might help you to work out what exactly it is you want