C - Login using file handling and linked list

I am creating an account using Create New Account option, & then writing the created username pwd to the file, but when I rerun the code & try to login using the same id, it fails. Using string compare, but it seems string is not being read.

struct user{ char username[10]; char password[10]; struct user *next; }*sUser,*pUser;

userlogin(void){
FILE *fp;
char uName[10], pwd[10];int i;char c;
sUser=pUser=(struct user *)malloc(sizeof(struct user));

printf("1. Login Through An Existing Account\n2. Create New account\n");
        scanf("%d",& i);
        system("cls");
        switch(i){
              case 1:
              fp=fopen("user.dat", "w");
              printf("Username: ");
              scanf("%s",&uName);
              printf("Password: ");
              scanf("%s",&pwd);
              fread (pUser, sizeof(struct user), 1, fp);
              while(pUser!=NULL){
                if(pUser->username==uName){
                if(pUser->password==pwd){
                    accessUser();
                }
                }
                pUser=pUser->next;
              }
              break;


              case 2: do{   fp=fopen("user.dat", "r");
                    printf("Choose A Username: ");
                    scanf("%s",&pUser->username);
                    printf("Choose A Password: ");
                    scanf("%s",&pUser->password);
                    printf("Add another account? (Y/N): ");
                    fflush(stdin);
                    scanf("%c",&c);
                    if(c=='Y'||c=='y'){
                    pUser->next=(struct user*)malloc(sizeof(struct user));
                    }
              }while(c=='Y'||c=='y');
              pUser->next==NULL;
              fwrite (sUser, sizeof(struct user), 1, fp);
              break;
             }
fclose(fp);
}

EDIT:

The value of pUser->username is not what it should be Can anyone tell me what I'm doing wrong.