The "/rptedit" page:

Create (/rptnew) or edit (/rptedit) a ticket report format. Query parameters:

name=N

Ticket report number or tag.

rn=N

Ticket report number (legacy). ^^^-- one of the two previous is required.

t=TITLE

Title of the report format

w=USER

Owner of the report format

s=SQL

SQL text used to implement the report

k=KEY

Color key

d=DESC

Optional descriptive text

m=MIMETYPE

Mimetype for DESC

x=TAG

Symbolic name for the report