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If your tax free form was issued by Global Blue, then this page of their site says:
Completed Tax Free Forms which have been stamped by Customs can be sent to:
Standard and registered mail: Global Blue P.O.BOX 363 810 00 Bratislava Slovakia, Europe
For courier: Global Blue, Prievozska 4D/Block E, 821 09 Bratislava, Slovakia, Europe
Use the Global Blue prepaid envelope provided by the shop where you made your tax free purchase. Alternatively, you may use your own envelope but you will need to pay for postage.
In case you obtained Downtown Cash Refund (Fast Refund/VAT OFF), Global Blue must receive your completed Tax Free Form and reciepts within 21 days of the purchase to avoid charges to your credit card, plus a penalty. For refunds with China UnionPay, the Form must be received within 15 days.
Before sending the documents, we advise that you make a copy of them, and write down Tax Free Form number (DOC ID) of each Form for your reference.