I only need to input about 10 blocks of data but I don't understand how to do it on this 5T the manual doesn't explain it very well. japenglish.
You can only run a single command in MDI mode. One M-code, one G-code (of each group), and a motion command is about it.
If you want to run 10 blocks, you'll have to use EDIT mode and key a short program into memory. That procedure is described in the 5T manual. Look in the table of contents for "Memory & Edit" or "Part program storage and Edit". It's in there.
What you need to do is erase the existing program from memory, key in each command and INSERT into memory, then RESET, shift to MEMORY mode, then press CYCLE START.