Creating update in Yii2

I have displayed data from another table to one table or one model. it looks like this

when I try to update that record, it would be like this

what should I do so that data from image 1 can be displayed in "Update"?

here's my relationship diagram

I display Jurusan from table aitambah to ais3 and I display NamaMahasiswa from table ai to ais3. I made table s3penghubung so that table aitambah can be related to ais3.