by asking the right question. If you ask a vague question you have a good chance of getting a vague answer .
as previously vaguely expained you have to do an auto scan
and let it complete.
This is based on your tv being connected to an antenna and being the model Apex Digital Apex LD4088 40 Class LCD HDTV - 1080p, 1920 x 1080, 16:9, 60Hz, 1800:1
You have to press menu button on your remote control when you see the message you saw on the tv screen.about Auto Scan. Then use the left and right arrows to select tv mode. Press the down arrow to select Air/Cable. Press the left or right arrow to select Air if antenna and Cable if it is a cable service. Once you have selected Air or Cable press the down arrow to select auto scan . If air then press right arrow on the remote (if cable then press enter on the remote)
This is explained on page 18 of the tv user manual
http://data.manualslib.com/pdf/1/84/8384-apex_digital/ld4088.pdf?0fa28d37b4d5ca4a9f59538bc95467d9
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