can you use this card each hero turn to gain+2 health

No. Everything on the Survivalist Card is a passive effect. Also note that Health is the Max HP, not the Current HP. (Figures in Descent don't have Current HP, they have Health and Current Damage.)

No, the card permanently grants you +2 health, you don't use it, it's passively active. The card is never activated or used at all, it's just always functioning.

thanks for your help I understand now. Increases max health by 2 using Syndrael so her health goes from12 to 14 +other effects on the card are passively active which means you gain them all the time at no coast to fatigue or actions

That is correct.