The translated version does all the same things as the original version, so you might be better off using it instead.
1) You can replace sprites in levels, but you can't modify them directly like you can in the SDK2 editor.
2) The output file contains the compressed map data ready to be inserted back into the rom. You can find the location to paste the data in the Map Properties section of the SDK2 editor. The compressed data must not be larger than the original data.
Alternatively, you can use the built-in import/export feature of the SDK2 editor.
And best to remove the name of that site while you still have the chance...