i am unable add a code activity to a sequence

I want to send the test thru email or send file to ftp

I have got inputs all required info like emailid ,subject,message or 

ftp server, username, password, Filename, to be sent
in an aspax and pass all the above to a workflow
Aspx in web application
workflow is activity library project
I am invoking the workflow from aspx page

In workflow , i have 2 code activities one each for send email and 

file to ftp

I have created a workflow in that i added an IF
(for user option of email and ftp)
in if and else part i have added a sequence
I want to add the code activity (email and ftp) one in each sequence
but i am unable to add

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Darani