You can vote at any time before your followee has voted. We do not allow overriding a followee vote after the fact since that would break the following structure for possible followers of your neuron, as well as the wait-for-quiet logic.
Updated
Voting
Using Neurons to Vote on Proposals and Earn Rewards
<% if (previousArticle) { %>
<% } %>
<% if (previousTitle) { %>
<% } %>
<% if (nextArticle) { %>
<%= previousTitle %>
<% } %> <%= previousArticle.title %>
<% if (nextTitle) { %>
<% } %>
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