WordPress上的Twig - 获取作者的帖子名称

I'm using a wp template based on Twig files called Realia. I'm using to buddypress and I want to add a link button to the author profile of post. I found this page who help me a lot but I want to find the author name and what I found is the ID author. Someone can help me ?

Here's my code :

 <a href="/members/{{post.post_author}}">Envoyer un message au propriétaire</a>

I found a way ! Thank a lot for your replies ! :)

    {% set id = post.post_author %}
    {% set author = wp.bp_core_get_username(id) %}
    <FORM ACTION="/members/{{author}}">
    <INPUT TYPE="SUBMIT" VALUE="Envoyer un message au propriétaire"></FORM>