I believe this is what you are looking for, pulled from the manual: (didn't see this section covered in the above link)
To delete a TSYS, use the FIND feature to search for the TSYS by name. Press PGM, then press the EDIT softkey, then press the FIND softkey, and use the Standard Text Entry Method to enter all or part of the TSYS name you wish to delete. Press the OK softkey to begin searching, and, if necessary, press the NEXT softkey to continue searching until the desired TSYS is located. Once the TSYS has been located, press the PGM key, then press FUNC CL. The scanner will ask you to confirm the delete command before removing the object from the scanner’s memory, then, provide a final warning that all TGRPs associated with the TSYS to be deleted will be lost if you proceed. Press the YES softkey at both warnings to delete the TSYS.
An alternative method is to browse TSYS objects only using the TSYS filter. Press PGM, then the EDIT softkey, then 444, and press the TSYS softkey. Scroll to the desired TSYS using the 56 keys, then press FUNC CL. The scanner will ask you to confirm the delete command before removing the object from the scanner's memory, then, provide a final warning that all TGRPs associated with the TSYS to be deleted will be lost if