How can I use my own instrument?

[cleanmaster]

i want to set a instrument which is not at The Patch Selector.Should I must create a new MIDNAM file?

[DHealey]

Select the plugin you want to use when you add the track:

[x42 (Robin Gareus)]

@cleanmaster

create a new MIDNAM file?

No. MIDI name files are only used for human readable labels. They have no effect on the sound.