how to activate or use $FIRSTPOSTID in postbit_legacy?

[gmptp]

I'll like to use $FIRSTPOSTID in postbit_legacy, how can I copy and paste $FIRSTPOSTID from showthread and use it in postbit_legacy? What additional code do I need to put it in postbit_legacy in order to use the $FIRSTPOSTID?

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or What is the code for the firstpostid in legacy_postbit?

below is the post id, but I want the 1st post id, what is the code for 1st post id?
"post$post[postid]"

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found the solution

use:

$thread[firstpostid]