Once the collection has been published, on the creators' minting page, before the minting starts, there is a button that says UPLOAD CSV.
When you click on this button, the following window will appear, in which you must select the CSV file containing the information with the wallets you want to add to the whitelist by this way.
Characteristics of the CSV file for adding wallets to the whitelist
Below, you can see the screenshot of a CSV file containing a series of wallets that we are going to add to the whitelist through this method:
As you can see, to create this file, in field 1A, you must type "walletAddress" and, in the following rows, you must place the addresses of the wallets (if you are not knowledgeable about how to create CSV files, a lot of details are given in How to create CSV files for uploading attributes to collection ítems?).
Well, once you have uploaded the CSV file with the wallets you want to add to the whitelist (after clicking on UPLOAD CSV), Tokenizzer will notify in the upper right margin that the upload was successful.
That's all! When the pre-sale stage begins, the wallets adhered through the CSV file will be able to participate in the minting.