怎么合并账号？

怎么合并账号？/ X* z+ T8 k; H2 i, e5 i' h

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- f: d. K+ _& x- a# B6 B7 y% y现在有个transfer的功能，能够把一个账号上的球员转到另一个账号上去。但是我转了后，告诉我这么一个信息：
, W! f3 y% t5 C* VBefore accepting any more players in your account you need 2 extra slots. You currently have player(s) in your account and 1 slots available.0 i7 _% a9 b/ Z4 j8 w# B' M

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怎么去获得slot?