you can use whatever you have really, royal icing is good, buttercream, or you can use a pin, as long as the people getting the cake know how to remove it.
technically, no fabric ribbon is food safe, so technically, you shouldnt use it... most people do though.
you can make edible ribbons from fondant/ gumpaste too.
xx
thanks brincess_b 
i dont think i would use a pin but royal icing sounds good. so i would pipe it around the cake and attach the ribbon right? or do i put the icing on the ribbon?
i am just worried for the fabric ribbon to stain from the icing. is there any hing else i can use except the fondant ribbon???
Hi mina_mina,
I have found that buttercream can sometimes leave grease marks through the ribbon so I started using piping gel. I Paint it on the ribbon (with a paint brush I use just for cake stuff) so I don't go above the ribbon and leave a mark on the cake.
i think you just need a dot of royal at the back to hold the ribbon together. you could see how it looks, and if you think it needs more, then add it round the cake.
you can line your ribbon with wax paper. i believe you can also iron wax paper over the ribbon so the wax sticks to the ribon, so nothing from the cake can seep through. dont quote me on that though!
xx
Hi, if you have covered the cake with fondant, you can use the wet ribbon method. Just wet the ribbon, take excess water out and wrap it around the cake!
You can use the normal rafric ribbons. 
wow that sounds very easy.. but wouldn't the ribbon look WET ?
and would it stay there all night? cause its going to be on a wedding cake...
I haven't tried this, but from the posts I have read in another forum said that it won't look wet and yes it will stay! Loads of UK decorators use this method especialy on wedding cakes!
Edited to say that you also can wet just the ends of the ribbons and stick them on the cake. But make sure the colour is not bleeding.
Or you can use double sided sticky tape. You have to hold one end of the ribbon with a pin (don't insert it into the cake, just to hold the ribbon) and then take a tiny piece of the tape and stick that on the end of the ribbon which is holding by the pin. Then take the other end of the ribbon and stick that on the tape! (hope it make sence) 
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