This is the sequence, you may be stuck at some point in between
1. Download sby's loader pack
2. Extract sby's loader pack
3. Run Loader Shortcut
4. Wait for SDT to finish loading.
5. bring up the options panel, navigate to Loader tab
6. bottom-right-corner are little white arrow buttons, these cycle through the system add-ons's options. click left arrow once
7. this is the animtools interface. hit the big grey button to load a position, it will open a file prompt
8. navigate to your downloaded position files and select one, hit open & thats it.
post more details if you're still experiencing problems.