MSP430G2955: How to shift the 7-bit I2C address to the left and add the R/W bit in Master receiver?

Hello everyone,

as i have look in the example of MSP430G2955 examples code,atasheet and user's example, i don't find the way to shift the 7-bit I2C slaveaddress to the left and add the R/W bit? i am bit confused.which regiter i should use and bit? is it  UCTR bit that represent the R/W bit,is it the  UCB0I2CSA where i have to use the left shiftin?

thanks