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When Abram was ninety-nine years old
This phrase is used here to mark the beginning of a new part of the story. If your language has a way for doing this, you could consider using it here.
God Almighty
"the all-powerful God" or "the God who has all power"
Walk before me
Walking is a metaphor for living, and "before me" or "in my presence" here is a metaphor for obedience. AT: "Live the way I want you to" or "Obey me" (See: rc://en/ta/man/translate/figs-metaphor)
Then I will confirm
"If you do this, then I will confirm"
I will confirm my covenant
"I will give my covenant" or "I will make my covenant"
covenant
In this covenant God promises to bless Abram, but he also requires Abram to obey him.
multiply you exceedingly
Here "multiply you" is an idiom that means he will give him more descendants. AT: "greatly increase the number of your descendants" or "give you very many descendants" (See: rc://en/ta/man/translate/figs-idiom)