Dumb question, but trying to do Narrow Font text but it's glitching out on me

I installed the narrow font page and I put in [_P][_e][_g][_a][_s][_u][_s][_SP][_K][_n]i[_g][_h][_t] for, well, Pegasus Knight, but it’s not registering in Narrow Font text. Is there something I’m missing, or am I dumb?

Are you using febuilder?

Wait, nevermind, I tested it. It works. lol