You can't open a Lifetime ISA on behalf of somebody else. If your child would like to open one, they must be aged 18-39 and have to enter their own details in the app, using their own device. This ensures their account is secure.
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The good news is, once they have set up their own account, they can send you their gift link from the Ideas tab. This link will open up a secure payment portal which will allow you to add anything from £10 to whatever's left of their £4,000 annual allowance, directly to their Lifetime ISA.
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Your gift will be boosted with the government's 25% bonus and this will be added to the account 4-6 weeks after you make your gift payment.
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You can use this link as often as you like, and help them to use as much of their annual £4,000 allowance as you wish.