how can insert values simultaneously into table

my doubt is i want to insert userid and checkbox values based on userselection then i also want to insert username from anoter table based on the similarity of the userid

 

for example  my table users 

 

it has userid ,username passwd, email.. here userdid is PK 

 

 second tblee mood --

 

here i will take userid and mood from the user after his selection

so, now after his selction of userid , i want to insert the username which is related to the selected userid ..

 

like the below table 

 

userid	mood	username
1	happy	sindhu

 

i think i have to make userid in mood table as FK and then how can i get username 

i am getting confused..Any Help is Appreciated .

Thanks in Advance.