First, usually after the opening dance, the host goes up to make an opening speech to warm up the scene. Next, please welcome the first singer. Just play your music and say hello to everyone.
Second, after singing the first song, you can introduce yourself. For example, hello, my name is XXX, and I am very happy to sing for you here. I hope you like it and bring you a XXX.
Third, don't talk too much. You are not the host. Generally, after you sing the first-hand song in the evening, the host will come up to tease you. He will communicate with you in advance before the performance. It can also be broadcast live. You just need to cooperate.
Fourth, remember: few words, concise, relaxed, natural, enthusiastic and casual.