Christians we are not to judge so how do we correct sin?

[Trilobiteme]

6 Brothers and sisters, if someone is caught in a sin, you who live by the Spirit should restore that person gently. But watch yourselves, or you also may be tempted. 2 Carry each other’s burdens, and in this way you will fulfill the law of Christ. 3 If anyone thinks they are something when they are not, they deceive themselves. 4 Each one should test their own actions. Then they can take pride in themselves alone, without comparing themselves to someone else, 5 for each one should carry their own load. 6 Nevertheless, the one who receives instruction in the word should share all good things with their instructor.

7 Do not be deceived: God cannot be mocked. A man reaps what he sows. 8 Whoever sows to please their flesh, from the flesh will reap destruction; whoever sows to please the Spirit, from the Spirit will reap eternal life. 9 Let us not become weary in doing good, for at the proper time we will reap a harvest if we do not give up. 10 Therefore, as we have opportunity, let us do good to all people, especially to those who belong to the family of believers.

[rene]

2 Timothy 4:2
New American Standard Bible (NASB)
2 preach the word; be ready in season and out of season; reprove, rebuke, exhort, with [a]great patience and instruction.

[Scooterpoopatlarge]

I use any stout object at hand.

[TonyStark]

The first and foremost thing is to make sure you don't have a "plank in your own eye" so to speak. If you have to confront someone, do it privately. Jesus said to "judge righteous judgment". Not jumping to conclusions is an important aspect of that.

[OpenMike]

We don't judge motives of the heart - that's where Christians go wrong so often.

But the outward action, we can see and we can judge when it's not in line with what's revealed.