Once you have recorded all 64 audio samples that make up the voice commands for a speaker file, it's time to upload them. Since it would be tedious to upload them one after the other, create a .zip archive that contains all 64 .ogg files. This can be done conveniently with dolphin: Open the directory where you stored the .ogg files, select them all and use the Compress => As zip archive menu entry from the context menu (right mouse button).
If all 64 .ogg files are packed in the .zip archive, use this website to upload your speaker file. It will gather some additional information like the speaker language as well.
Do you want to file more than one speaker file? No problem, just upload each.