how can i bypass adb/fastboot to flash twrp. cannot access recovery or download modes

first, i apologize if some of my punctuation is off. im using a laptop where some of the buttons dont work properly. ok. heres the deal. last night i flast twrp using adb and fastboot. everything appeared to take just fine. then this morning i went to do some tweaking and discovered this message, your device software cannot be checked for corruption. lock the bootloader...
then it says press the power key to continue.. so i cant use the power key to access any modes
so what do i do to continue installing custom rom on my device and also to root. i should have mentioned that i am operating off of a lg aristo with 7.0

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