?不用约束

... take it easy凡事看开些,不要太冲动,不要看得那么重 make yourself comfortable不用约束 (招待客人时说的话) you are all wet你完全误会了 ...

?别拘束

... make yourself at home 别拘束 make yourself comfortable 别拘束 make yourself heard 发表意见 ...

?让自己舒服些

... I might add - 我应该补充一下 make yourself comfortable - 让自己舒服些 you might be in for a bit of a shock - 你可能会大吃一惊! ...