I can't figure out how to insert related record ID numbers dynamically. In the sample below they are hard coded and it works as needed, but I need the ID's included in the loop to insert records.

Thank you in advance for you help! 


public class DataListingController {

    public String CID;
    public List<Wrapper> Wrapperlist {get;set;}

    public DataListingController(){
    
        CID = ApexPages.currentPage().getParameters().get('id');

        //Fetch Referrals
        List<Data_Feed__c> dfList = new List<Data_Feed__c>();

        Wrapperlist = new List<Wrapper>();

        dfList = [SELECT ID, NAME, Rental__r.NAME, Data_Client__r.ID FROM Data_Feed__c WHERE Data_Client__c=:CID ORDER BY Rental__r.NAME];
        
            if(!dfList.isEmpty()){
                
                for(Data_Feed__c df: dfList) {
                
                    Wrapper wrap = new Wrapper();
                    wrap.isSelected = FALSE;
                    wrap.dfeedObj = df;
                    Wrapperlist.add(wrap);
                }
            }       
        }

    /* Insert Apartment functionality based on selected records
    */
    
    public void InsertApartment(){
        
        for(Wrapper wr : Wrapperlist){
        
            if(wr.isSelected = true){
                
                Data_Listing__c dl = new Data_Listing__c();
                    dl.Data_List__c='a0g55000000S7Cs';
                    dl.Data_Feed__c='a0m55000001Ihno';
                    insert dl;
            }
        }
    }
    
    /* Wrapper class with checkbox and Apartment object. 
    this is also  called as inner class 
    */

    public class Wrapper{
    
        public boolean isSelected {get;set;}
        public Data_Feed__c dfeedObj {get;set;}
        public Data_List__c dlistObj {get;set;}
               
    }
     
}