I am not a moderator, but I think I have a general idea.
To upload any file, click on the files button on the bottom of the page. Then click upload file, and then browse for your file.
If you are trying to upload a program on this wiki, go to the archives. Click where it says Add to Archives and just follow the instructions. When you get to the edit page, enter the name, your name, the size if applicable, and the description. Click save.
Then, upload your file. Your program file should be a *.zip file with your program, a *.txt file readme, and a picture (optional). When that is uploaded, you are technically done until a moderator comes by and finishes it.
For details on creating your files from the calc to the comp, use a calculator connect system, like TI Connect and simply transfer the file. Then right click it and press Send To… and click compressed folder. You can copy and paste any other files to that folder. I don't know if this helped any; you probably knew it all, but this is all I know.
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Timothy