Draw your curve or arc or circle.
Then put a point were you want your lettering to start. You can divide the arc or if it is drawn the right length, (Ie: it starts were you want), then you can use the end as the start point.
Select chain text under the text funtion.
Set you attrabutes to the size you need and set the font style.
Then type in the text you want. Left, centered or right will change were the text is placed on the line. This also will depend on which side the arrow is on when you select the arc.
In the picture below you will see the arrow is on the inside when I selected the chain. So I had the justification set to left. So it put the text to the left of the arrow or on the outside.
Then select the chain, at the start point you want(left click), point the arrow in the direction you want(then left click), and hit the "]"(left bracket) key (which will pick the whole chain) or pick the last part of the chain if you don't want to text the entire chain.
And Bam the text is placed along the arc.