ASP.NET MVC using Entity Framework many to many relationship

Question

i have a problem with many to many relationship using entity framework

how to perform CRUD Function and not using repository pattern

for e.g.  i have three table

1. Table 1 is for Posts which stores post id and other details

2. Table 2 is for tags which stores all tag id and tagname

3. Table 3 is for POSTTAG which stores PostID and TagID

 

i am using listbox for multiselect tags  and able to insert new post with tags into database but unable to edit and delete that posts with tags

So Any Expert Can explain me CRUD Action How to perform or share your with me