Hi, I am an eldritch knight human fighter and I am having to add another spell. I currently have magic missle, false life and identify. Which other 1st level spell should I add? Thank you. 

Hi there, I might have a suggestion, but first you might need to consider that your current list of spells does not fall in line with the spell selection available to an Eldritch Knight. Unless you have special arrangements with your DM, the Eldritch Knight has the following restriction on spell choices (underlines added by me for emphasis):

You know three 1st-level wizard spells of your choice, two of which you must choose from the abjuration and evocation spells on the wizard spell list. The Spells Known column of the Eldritch Knight Spellcasting table shows when you learn more wizard spells of 1st level or higher. Each of these spells must be an abjuration or evocation spell of your choice, and must be of a level for which you have spell slots....Whenever you gain a level in this class, you can replace one of the wizard spells you know with another spell of your choice from the wizard spell list. The new spell must be of a level for which you have spell slots, and it must be an abjuration or evocation spell, unless you’re replacing the spell you gained at 3rd, 8th, 14th, or 20th level from any school of magic.

You current list includes: False Life (a Necromancy spell), Magic Missile (an Evocation spell), and Identify (a Divination spell). According to the restrictions of Eldritch Knight spellcasting, you can keep Magic Missile and either Identify or False Life, but you cannot have both. 

Here are some great options for replacements and ideas for your next spell choice: Shield, Protection from Evil and Good, Thunderwave, Chromatic Orb.  

I hope this is helpful.

If you are taking Lightspeed's advice, I would recommend Find Familiar.

Find familiar is conjuration. Same problem - if you keep one of false life or identify, you can't pick up find familiar until 3rd level, when you can pick another spell from any school of magic.

Absorb elements is my absolute favourite pick, if you have Xanathars. It a) uses your reaction, b) reduces incoming damage and c) increases the damage of your next attack.

One of the biggest things to think about with Eldritch Knight is when you are going to cast your spells - in most turns you want to use your action for an attack. So spells you can cast as a bonus action or a reaction are going to be the most useful, reactions especially so because these mostly go unused.

Quote from Maestrino >>

Find familiar is conjuration. Same problem - if you keep one of false life or identify, you can't pick up find familiar until 3rd level, when you can pick another spell from any school of magic.

 Yeah, just if he gets to reconfigure his spells, I would recommend it 

i would take thunderwave having enemies knocked down could really help your other team mates.

unless of course you prefer to protect yourself then i would take shield