How to train?

[Threnus]

How do you grow the fig cutting so you don’t have this awkward bump in the main trunk? See image.

[Ktrain]

I think you will see that as the tree matures, and the main trunk gets larger in diameter that the "awkward" bump will get much smaller.

Give it some time.

[Kid Fig]

You could re-pot it in a deeper container and submerge the bump under the soil.

And to prevent shock (or at least reduce it) you wait untill it goes dormant during winter.

I've done this when transferring 1 gallon pots to the 3/5/7 gallon pots.

[Figology]

Warning: I'm no expert.
1. Perform a cleft graft with one of the 2 shoots onto the "bump."
2. Pinch your tips to induce limbs and hopefully get branches to grow on the right side- espalier style.

[Rudy]

Kid Fig is right, when you up pot, lay it on its side with the growth vertical or just plant it deeper. Also like Ktrain states be patient and it will blend in.