When you select ILS Rwy 06 you are presented with two IAFs - TLA and UW. Select UW and then you can use LNAV. Once you are on inbound course, press LOC, dial 40 degrees in heading window, right click center select button and the plane should capture the localizer. When localizer is captured press  the APP buttton. Set your altitude to 2000 feet. 4000 is too high. By the time you capture the localizer you will be above the glideslope. Don't rely on VNAV for any of this. You need V/S to control the rate of descent to 2000. And go slow because you are doing all this in 12 miles.

Michael Cubine