Help seeming

Ok, maybe i´m dumb but really, after all the work knitting my first sweater i don´t know how to seem it!!! :hair: i´ve seen amy´s videos and know the side by side seeming, but what i´m i supposed to do with the top part? here´s the link of the pattern
please help me!!! :pray:

Have a look here for an excellent online resource.

thank you sooo much!!! :muah: