EMB ERJ 170/175 ER/LR
Flight Crew Air Transport Pilot (ATP)
Flight Crew Type 3826
Communication Breakdown; Situational Awareness
Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Weight And Balance; Inflight Event / Encounter CFTT / CFIT
Flight Crew FLC complied w / Automation / Advisory; Flight Crew Became Reoriented; Flight Crew Returned To Clearance; Flight Crew Took Evasive Action
Human Factors; Procedure
After we got the takeoff data; I put Zero Fuel Weight (ZFW) on performance INIT 3/3 in 4L. I noticed we have to move 3 passengers from C to A. I got distracted after we got the new data. I forgot to confirm the ZFW in the performance page. I thought I confirmed it but actually; I didn't. I put the speed; temperature; ECS and flex. Then we started taxing. When we reached the end of the runway; I noticed on top of the speed tap FMS speed showing 3 dashes. I checked the takeoff page and saw all the speed and flap showing correct. I thought it's a glitch. I put the speed to manual speed and did the takeoff from runaway 09. After takeoff; we flew tower assigned runway heading. During climb out; got a frequency change to Center and got direct to Initial Fix. Did a left turn and started to climb. During climb; we got CAUTION TERRAIN Aural Message. Hence we made a left turn and avoid the weather balloon. After that; we went direct to Initial Fix. Mean time going through the performance INIT page; I noticed I forgot to confirm the ZFW. At that point; I confirmed and fix the FMS speed problem and continued the flight. [My] suggestion [is to] avoid getting distracted while putting the numbers and double-check the numbers after we did.
EMB-175 Captain reported that after making changes to the takeoff data he did not confirm the zero fuel weight.  Captain also reported a CFTT warning during the takeoff.