It tells me I cannot access the dvr at the shop to get live view. How do I fix this problem?

Most phones will chew through battery life while roaming data is on due to the phone continuously sending and receiving data to the network. You need to shut down apps while not in use and turn off net access/roaming data. your actual local network system might also be weak which can cause drop outs. Not necessarily the phones' fault (I live in a dead zone near an airport and mobile coverage is mediocre at best)

Just input that into the search window in the app store, if it exists it will pop up.

Unless you added that feature via another app like findmyphone.com, or the manufacturer of phone had installed an app. It would be most difficult. Call your carrier where you purchased the phone and tell them of your loss and to shut down your phone.

more info is needed what kind of dvr and which model of galaxy s4?

You can try here... not exactly sure what you are looking for but there is information on the VCE300 series DVR's on this page:
http://www.digimerge.com/support/discontinued/

install ip cam from the app store.

Yes you can definitely view your CCTV footage on your mobile phone at your work via internet. Sentient CCTV DVR basically is a night vision camera. You must know the IP of the camera and IP Video server. Connecting your phone to CCTV camera via the protocol you can view the CCTV footage's in your phone. Night vision cameras are used for surveillance purpose. I would prefer cctv camera with ir illuminator for good image quality in the night time that will clear footage quality in my phone.
Recently many new applications have also being launched by security cameras with a view to solve problem you mentioned.

there should be a settings in recording.. its either something like Linear or circular.. select circular and it will record over the earliest footage on a continuous loop.

I have the ame problem. also need help with email setup. digimerge will not help. horrible co. they say I have to pay a tech to come out. no support whatsoever.

The installer manual and the operator manual for the D204161 are both available here: http://www.digimerge.com/Security-DVR-D204161/ . Click on the Download tab. The direct link for the operator manual is: http://www.digimerge.com/images/file/76/Operators%20Manual%20for%20the%20D204%20Series.pdf .

I hope this helps.

Cindy Wells