A quantum symmetric pair consists of a quantum group and its coideal subalgebra (called an i-quantum group). A quantum group can be viewed as an example of i-quantum groups associated to symmetric pairs of diagonal type. In this talk, we present a Serre presentation for quasi-split i-quantum groups, and a current presentation for affine i-quantum groups. As an application, the braid group symmetries are introduced. This is joint work with Xinhong Chen, Weiqiang Wang, Weinan Zhang.